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Articles

Articles for developers, by developers

Technical insights from building React and React Native production-grade apps, contributing to core libraries, and solving complex cross-platform challenges.

TV
10/3/2025

Cross-Platform TV Apps With React Native for tvOS, Android TV, and Tizen

While widely known for mobile, React Native's flexible architecture makes it a proven and practical solution for building TV applications. This article explores how "out-of-tree" platforms allow developers to escape the fragmented world of traditional TV SDKs (tvOS, Android TV, webOS) and unify their workflow. Whether your team is new to React Native or already has a mobile codebase, you'll discover the benefits of code sharing, improved developer experience, and how major companies are using it to efficiently deliver production-ready apps to the living room screen.

Łukasz Chludziński

Software Engineer

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Callstack

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AI
8/6/2025

On-Device Speech Transcription in React Native with Apple SpeechAnalyzer

This post introduces speech transcription support in React Native AI, implemented using Apple’s SpeechAnalyzer and SpeechTranscriber APIs available in iOS 26. It explains how to use the AI SDK’s transcribe function to pass audio buffers, how modular analysis is configured through the SpeechAnalyzer class, and how system-level asset management ensures models are handled outside the app bundle.

Mike Grabowski

CTO & Founder

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Callstack

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Cross-Platform
8/5/2025

How Node-API Works in React Native: A Deep Dive

In this deep dive, we explain how Node-API is brought to React Native—from discovering and bundling native addons to loading them at runtime. We also walk through the design of the host system and tools that make it all work.

Kræn Hansen

Software Engineer

@

MongoDB

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Super Apps
7/31/2025

Running Multiple Instances of React Native in Sandbox

While micro-frontend architectures have revolutionized feature delivery in React Native, they don't solve the core problem of runtime isolation. This creates security and stability risks, especially when integrating code from third-party developers. This article introduces react-native-sandbox, a powerful library that allows you to run multiple, fully isolated React Native instances inside a single host application. We explore how this sandboxing approach provides true crash containment, configurable security permissions for native modules, and enables independent team delivery, paving the way for truly modular and secure super apps.

Aliaksandr Babrykovich

Senior C++ Engineer

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Callstack

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AI
7/30/2025

On-Device Text Embeddings in React Native With Apple NLP Framework

Our React Native AI library now supports on-device text embeddings by integrating Apple's native Natural Language framework. This implementation leverages the NLContextualEmbedding model built directly into iOS. Because the model is treated as a shared operating system asset, it enables powerful semantic features without requiring developers to bundle large files or force users to perform any extra downloads. We expose this capability through our Vercel AI SDK provider, simplifying integration for React Native developers.

Mike Grabowski

CTO & Founder

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Callstack

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Developer Experience
7/28/2025

Introducing Rozenite: A Plugin Framework for React Native DevTools

Rozenite is a new open-source plugin framework for React Native DevTools, designed to help teams build custom debugging panels with ease. It supports TypeScript, React, React Native, and integrates with Expo, CLI, and Rock. With device-scoped views and isomorphic communication, Rozenite empowers developers to streamline observability and scale tooling fast.

Szymon Chmal

Software Developer

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Callstack

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AI
7/25/2025

Expanding On-Device Apple LLM Capabilities: Introducing Tool Calling

We’ve just added tool calling to our Apple provider for the AI SDK, unlocking the ability to run custom functions directly within Apple’s on-device language model. This means your React Native apps can now generate dynamic, interactive content, like fetching live data or executing app-specific logic, without ever leaving the device.

Mike Grabowski

CTO & Founder

@

Callstack

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Performance
7/24/2025

Exploring Fibers: Cooperative Multitasking and Lock-Free Task Execution

This third installment in our performance series focuses on building a cooperative, fiber-based task scheduler. We explore what fibers are, how they relate to coroutines, and how to organize tasks using atomic counters instead of traditional locks. You’ll learn how to avoid blocking, manage dependencies across tasks, and profile execution with Tracy. The concepts apply across languages and runtimes, offering a foundation for designing lock-free systems that scale efficiently on modern CPUs.

Mariusz Pasiński

Software Engineer

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React Native
7/21/2025

Performant and Cross-Platform Shimmers in React Native Apps

react-native-fast-shimmer brings high-performance shimmer effects to React Native, offering developers a modern alternative to spinners. Built with SVG and Reanimated, it enables fluid, synchronized animations with minimal overhead, even when rendering many placeholders at once. It is designed for customization and easy integration with Expo, bare React Native apps, as well as other platforms.

Kewin Wereszczyński

Software Engineer

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Callstack

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React Native
7/17/2025

Build and Run Node-API Modules in React Native

Node-API allows you to write native modules that run not only in React Native but also in other JavaScript runtimes like Node.js. In this deep dive, we'll guide you through creating a simple Node-API module, testing it in Node.js, getting it up and running in React Native, and finally, publishing it to npm for wider use.

Jamie Birch

Engineer

@

Scoville, NativeScript TSC

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AI
7/14/2025

On-Device Apple LLM Support Comes to React Native

Apple’s on-device LLM is now available in React Native, enabling developers to build private, fast, and offline AI features powered by Foundation Models. This preview release supports text generation, streaming, structured outputs, and first-class support for Vercel AI SDK. A stable version is planned for release alongside iOS 26 later this fall.

Mike Grabowski

CTO & Founder

@

Callstack

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Article
10/3/2025

Cross-Platform TV Apps With React Native for tvOS, Android TV, and Tizen

Learn why React Native is a powerful choice for TV app development. Discover how it unifies development for tvOS, Android TV, Tizen, and more with a single codebase.
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Article
10/3/2025

From Unit to E2E: A Guide to Testing React Native TV in 2026

Standard mobile testing tools fail for React Native TV apps due to D-pad navigation. This guide shows how to build custom helpers for React Native Testing Library that emit hardware key events and how to configure Appium for end-to-end testing on tvOS and Android TV.
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Article
9/23/2025

Bridging Animated.Value and SharedValue in React Native

Animated.Value and Reanimated’s SharedValue don’t interoperate, making it hard to mix components across libraries. This article explains why and shows how to connect them natively without relying on the JavaScript thread.
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Article
9/16/2025

Debugging Android Connectivity Issues with Metro Bundler

A practical guide to fixing the "Unable to load script" error in React Native when the Android emulator can’t connect to Metro.
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Article
9/11/2025

How to Use Liquid Glass in React Native

Learn how to bring Apple’s new Liquid Glass design material into your React Native apps. This guide covers design best practices, performance tips, and examples using LiquidGlassView and LiquidGlassContainerView.
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Article
9/8/2025

How to Add Custom JSI Bindings in Your TurboModule (and Why You Might Need Them)

TurboModules provide a type-safe way to write native code in React Native. JSI sits underneath as a lower-level API, enabling direct interaction with the JavaScript runtime. Beyond what TurboModules expose, JSI gives you access to powerful features, such as working directly with ArrayBuffers. This article shows how to inject a custom binding step by step.
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Live Stream
Live Stream
10/2/2025

Building React Native App for Vega OS

React 19.2 brings <Activity> and useEffectEvent, new ideas for React state management arrive, and Vega OS debuts as a React Native-powered Linux OS.
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Live Stream
Live Stream
9/25/2025

Live Dev Session: <Activity>, Expo SDK 54, Router v6, Lynx 3.4, TanStack Start

A packed week in the React ecosystem: React experiments with a new <Activity> component, Expo SDK 54 speeds up builds, Expo Router v6 adds native-like navigation, Lynx 3.4 ships inputs & dev tools, TanStack Start hits RC, and React Router previews Framework Mode.
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Live Stream
Live Stream
9/11/2025

Live Dev Session: React Universe Conf, RN 1.0, Expo Updates & More

In Week 37 of our Live Dev Session we talked about React Universe Conf with guest Szymon, ranted about AI, explored what React Native 1.0 really means, reviewed Expo updates, and covered the latest moves in the React Native ecosystem.
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Podcast
9/18/2025

Core Contributor Summit 2025 Highlights

Core contributors from across the React Native ecosystem discuss stability, tooling, and the path to 1.0, from Flow to TypeScript, desktop apps, and how community fills the gaps left by Meta.
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Podcast
8/13/2025

Observability and OpenTelemetry in React Native

Learn how Embrace and OpenTelemetry can help React Native teams standardize observability and improve app monitoring across platforms.
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Podcast
7/16/2025

Structure Monorepo for Speed, Scale & Sanity

Discover how Nx empowers teams to build and scale monorepos without losing their sanity, from selective testing to AI-powered workflows.